METHOD OF DETERMINING ASPARTIC ACID IN AQUEOUS SOLUTION Russian patent published in 2008 - IPC G01N31/16 

FIELD: analytical methods in food industry.

SUBSTANCE: invention relates to analytical chemistry of organic compounds and is intended for use in development of processes of production of biologically active supplements, polyvitamins, and protein mixtures. Method comprises preparation of aqueous solution of aspartic acid and quantitative determination of acid. More specifically, to aqueous solution of acid, crystalline lithium sulfate is added as desalting agent and then mixture of hydrophilic solvent is added to water-salt solution of acid, said mixture of hydrophilic solvent being prepared from butyl alcohol, acetone, and ethyl acetate. Thereafter, extract is separated and amount of aspartic acid is determined therein with the aid of potentiometric titration technique, which involves plotting differential curve of medium potential vs. volume of titrant and calculating degree of recovery of aspartic acid using suitable formula.

EFFECT: accelerated analytical procedure using safety reagents.

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